Advantages and disadvantages of synchronous motors
Advantages of synchronous motors
1. The speed is constant and independent of load.
2. These motors usually operate at higher efficiency
3 .Electromagnetic power varies linearly with the voltage.
4. These motors can be constructed with wider air gaps than induction motors, which make them better mechanically.
5. An over excited synchronous motor having a leading power factor can be operated in parallel with induction motors.
Disadvantages of synchronous motor
1. It cannot be started under load.
2. It requires dc excitation which must be supplied from external source.
3. It has a tendency to hunt.
4. It cannot be used for variable speed jobs as there is no possibility of speed adjustment.
5. Collector rings and brushes are required.
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